Add tests for how LocalStorageContextMojo interacts with file/leveldb services.

content/browser/dom_storage/local_storage_context_mojo.cc

Index: content/browser/dom_storage/local_storage_context_mojo.cc
diff --git a/content/browser/dom_storage/local_storage_context_mojo.cc b/content/browser/dom_storage/local_storage_context_mojo.cc
index 241daeddff43a13c0a40d48c83b9f391f26d3ce6..fa68355acc9aff1da5c02d93014a3a40695257dc 100644
--- a/content/browser/dom_storage/local_storage_context_mojo.cc
+++ b/content/browser/dom_storage/local_storage_context_mojo.cc
@@ -141,10 +141,13 @@ void LocalStorageContextMojo::OnDirectoryOpened(
   // database.
   file_service_connection_->GetInterface(&leveldb_service_);
 
-  leveldb_service_->Open(std::move(directory_), "leveldb",
-                         MakeRequest(&database_),
-                         base::Bind(&LocalStorageContextMojo::OnDatabaseOpened,
-                                    weak_ptr_factory_.GetWeakPtr()));
+  auto options = leveldb::mojom::OpenOptions::New();
+  options->create_if_missing = true;
+  leveldb_service_->OpenWithOptions(
+      std::move(options), std::move(directory_), "leveldb",
+      MakeRequest(&database_),
+      base::Bind(&LocalStorageContextMojo::OnDatabaseOpened,
+                 weak_ptr_factory_.GetWeakPtr()));
 }
 
 void LocalStorageContextMojo::OnDatabaseOpened(